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For the first time since 2003, Apple is expected to report a decline in year-over-year earnings and sales.

Analysts surveyed by Thomson Reuters estimate that Apple will report $2 a share on sales of $52 billion for the quarter ended March -- down from the same quarter a year ago, when Apple reported $2.33 a share on sales of $58 billion.

While Apple has been releasing new products, including the Apple Watch, its business still remains heavily dependent on the iPhone, whose sales have been declining.

Following are five key issues that Apple partners would like CEO Tim Cook to address on the Cupertino, Calif.-based company's quarterly earnings call.